Dye Adsorption and Electrical Property of Oxide-Loaded Carbon Fiber Made by Electrospinning and Hydrothermal Treatment

Abstract

Our current study deals with the dye adsorption and electrical property of a partially carbonized composite fiber containing transition metal oxides including, iron oxide, nickel oxide, and titanium oxide. The fiber was made by electrospinning, carbonization, and hydrothermal treatment. During the electrospinning, titanium oxide particles were dispersed in polyacrylonitrile (PAN) polymer-dimethylformamide (DMF) solution. Nickel chloride and iron nitrate were added into the solution to generate nickel oxide and iron oxide in the subsequent heat treatment processes. The polymer fiber was oxidized first at an elevated temperature of 250 °C to stabilize the structure of PAN. Then, we performed higher temperature heat treatment at 500 °C in a furnace with hydrogen gas protection to partially carbonize the polymer fiber. After that, the oxide-containing fiber was coated with activated carbon in a diluted sugar solution via hydrothermal carbonization at 200 °C for 8 h. The pressure reached 1.45 MPa in the reaction chamber. The obtained product was tested in view of the dye, Rhodamine B, adsorption using a Vis-UV spectrometer. Electrical property characterization was performed using an electrochemical work station. It was found that the hydrothermally treated oxide-containing fiber demonstrated obvious dye adsorption behavior. The visible light absorption intensity of the Rhodamine B dye decreased with the increase in the soaking time of the fiber in the dye solution. The impedance of the fiber was increased due to the hydrothermal carbonization treatment. We also found that charge build-up was faster at the surface of the specimen without the hydrothermally treated carbon layer. Electricity generation under visible light excitation is more intensive at the hydrothermally treated fiber than at the one without the hydrothermal treatment. This result is consistent with that obtained from the dye adsorption/decomposition test because the charge generation is more efficient at the surface of the hydrothermally treated fiber, which allows the dye to be decomposed faster by the treated fibers with activated carbon.

Effect of harvesting age of plant and pectinolytic selected-fungi in biodegumming ramie performance

“…The evaluation hands feel were performed using method for sample of fabrics [27] with some modification. The samples fiber with difference Dyeability test was done by modification of method [34]. Control ramie fiber and the results of the bio degumming process are dyed with reactive dyes by immersion at room temperature (reactive dyes are textile dyes that have the ability to react and bind covalently to the cellulose molecular chains present in flax fiber).…”

Advances in Manufacturing Composite Carbon Nanofiber-Based Aerogels

“…Therefore, it is necessary to make very fine nanoparticles because the finer the nanoparticles, the bigger the interface area, the longer the scattering time in addition to a larger absolute value of E ν . By changing the diameters of the particles and the carbon nanofibers ranging from several nm to hundreds of nm using the approaches as previously shown in [79][80][81], the conductivity σ, the scattering time τ, and the ν-th energy level E ν was calculated and compared with experimental measurement results. Based on the comparative studies, necessary modification on the model were made.…”

Electrospun PVP/TiO2 Nanofibers for Filtration and Possible Protection from Various Viruses like COVID-19

“…Incorporating a nanofibrous medium into membrane filtration will increase it even further. Saurabh Kansara et al [12], in their recent work, has fabricated carbonized composite fibers with transition metal oxides like nickel oxide, iron oxide, and titanium oxide. A Vis-UV spectrometer was used to analyze the finished product for adsorption of the dye Rhoda-mine B.…”